Channeling-tool.



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GHANNBLING TOOL. Arrmonmn FILED un. 2e. 190s;

Anomvevs JOHN C. MERCER, OF BARRE, VERMONT.

CHANNELING-TOOL.

Specification of Letters Ratent.

Patented Aug. 4, 1908.

Application led March 26, 1908. Serial No. 423,361.

To all 'whom it may concern:

Be it known that I, JOHN C. MERCER, a citizen of the-United States, and a resident of Barre, in the county of Washington and State of Vermont, have invented a new and Improved Channeling-Tool, of which the following is a full, clear, and exact description. This invention is an improvement in stone and rock cutting tools, and is designed as a channeling tool, in which capacity it is especially useful in' the working of granite.

At granite quarries and stone dressing works itis frequently necessary to remove or cut one large piece of granite from another. The usual practice is to do this by drilling a series of holes alone' the line the stone is to be cut and then breai the stone out through the holes. This operation entails considerable time and labor and necessitates considerable dressing of the stone where broken out, owing to the furrows left by the drill holes. By the use of a tool constructed in accordance with my invention, when used in a pneumatic or other power drilling machine,

a channel is rapidly cut along the line the stone is to be divided, and very little, if any, dressing on the faces formed by the channel is required.

Reference is to be had to the accompanying drawings lforming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of a stone channeling tool embodying my invention; Fig. 2 is an edge view of the same; Fig. 3 is an edge view of a modified form of my improved channeling tool; Fig. 4 is a side elevation of the same; Fig. 5 1s an end view of the tool shown in Figs. 1 and 2; and Fig. 6 is an end view of the tool shown in Figs. 3 and 4.

The tool is constructed of steel and preferably has theconventional cylindrical shank l() for fitting within the socket of a pneumatic or other power drilling machine. The body of the tool on its wide or side face tapers from the shank to the point, with the enlarged end arranged at the cutting edge, and the side edge of the said body is preferably made thinner at the cent-er and tapers both-to the point and to the cutting edge, atv

principal feature of the invention, is formed y cutting one or more transverse notches in/ the end to form a suitable number of cutting teeth 11, these teeth being flattened on the point, as clearly shown in Figs. 1 and 4. In Figs. 1, 2 and 5 I have shown the notch separating the`teeth as centrally arranged, producing two teeth which are beveled off at the outside. In Figs. 3, 4 and 6, three teeth are provided, the outer teeth being arranged at the edges and adapted to cut a channel having square corners at the bottom, 'whereas the cutting edge of the tool shown inthe other figures will cut on the bevel, and is more especially intended for roughino purposes.'

I have found in practice t iat a tool con'- structed in accordance with my invention considerably saves in both time and labor over the usual method of working granite, and can be used to great advantage in hollowing vases, cutting windows in vaults, cutting steps and such other similar work; also, after the stonehas been cut, no further dressinor is generally needed.

x:Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A tool for channeling stone, having a thickened point rovidedv with a cross notch forming lattene( teeth.

2. A tool for channeling stone, tapering in both width and thickness, with the enlarged portion arranged at the point where it` is rovided with a transverse notch forming i attened cutting teeth. n

3. A tool for channeling stone, tapering 1n both width and thickness, wlth the enlarged portion arranged at the point, and transverse teeth formed" on said point,- having straight parallel cutting edves.

In testimony wIiereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOI-IN C. MERCER.

Witnesses:

Jon): IVATT, Jamas MACKAY. 

